Starch Derivatives of High Degree of Functionalization. 4. Homogeneous Tritylation of Starch and Subsequent Carboxymethylation

Esterification of Polysaccharides

“…In the case of monomethoxytriphenylmethyl chloride as reagent, an additional conversion step is necessary to synthesise products with DS 1. These procedures are less selective, compared with the single-step tritylation [441]. Moreover, regioselectivity can be achieved by enzymic transesterification, as shown for regenerated cellulose, 6-O-trityl cellulose and 2,3-O-methyl cellulose, when reacted with vinyl acrylate under enzymic catalysis (subtilisin Carlsberg).…”

Unconventional Methyl Galactan Synthesized via the Thexyldimethylsilyl Intermediate: Preparation, Characterization, and Properties

“…In contrast to this, efficient methods have been developed for regioselective functionalization of cellulose and starch by employing bulky triphenylmethyl ethers or trialkylsilyl ethers as protecting groups 11, 12. For example, use of the thexyldimethylsilyl (TDMS) group allows the synthesis of both 6‐ O ‐protected and 2,6‐di‐ O ‐protected cellulose and starch derivatives by simply varying the reaction conditions 13.…”